Milling machine



July 29, 1930.

-r-:. J. 'EAkNEY ET AL MILLING IACHINE Filed luv. 21. 1924 F'IGG f YINVENTORJ 'BY M ,WTW M ATTORNEY.

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Patented July 29, 1930 "UNITED "STATES PATENT OFFICE EDWARD J. KE N Y, on wAUwArosA, Ann aosnrrr IB. ARMITAGE, or MILWAUKEE, isconsin, Assleuons T rnannnr a ten-norms oonroaarrolv, or WEST ALLIS,

W G NS N MILLING MACHINE Application filed November '21, 1924. Serial No. 151,221.

This invention relates to improvements in milling machines and, more particularly, to a' milling machine construction in which the over arms are mechanically adjustable.

it is the primary object of this invention to provide a novel and simple mechanical means for the adjustment of over arms such as are used in machine tools, and particularly in milling machines of the knee and column type.

. More specifically stated, it is the object of this invention to provide a mechanical device for adjusting the over'ar-ms of machines employing a plurality of such over arms, and .to provide for this purpose a simple adjusting device susceptible of manipulation for selectively ad usting any of a plurality of over arms independently orfor simultaneously adjusting a plurality of over arms.

in the drawings:

Figure 1 is a side elevation of the upper portion of a milling machine column equipped with a device embodying this invention.

Figure 2 is a detail view on an enlarged scale taken on the section indicated at 22 in Figure 1.

Figure 3 is a detail view on an enlarged scale showing the milling machine column broken away to expose its interior construc tion on the section indicated at 33 in Fig ure 1.

Figure i is a detail section taken on a reduced scale on line l4 of Figure 3.

Figure is a detail section taken on a reduced scale on line 55 of Figure 3.

Figure 6 is a detail view in axial section on an enlarged scale of one of the pinions utilized to adjust the over arms.

Like parts are identified by the same refercnce characters throughoutthe several views. 1

The milling machine column '10 may be generally of any standard construction, with the exception that it is preferably so organized. as to provide vertical slots 11 opening into the bearings 12 in which the over arms and 16 are axially adjustable. The slots 11 are traversedby a bolt 17 upon which the nuts 18. are threaded for operative engagement with those portions of the structure of column which lie exteriorly adjacent the over arms. Thus, when either of the nuts 18 are tightened the. over arms will be simultaneously clamped against axial movement by the springing of the column structure. This arrangement is more particularly described in a companion application No. 751,220, filed November 21, 1924;. A

There is preferably one of the above described bearings and clamps at the front of the column and an additional bearing and clamp at the rear of the column. The jabove description will apply in general to both clamps;

' The over arms and 16 are used for the support oi a tool carrying, spindle driven, arbor 20 by means of pendants, one of which is shown at 21. This arrangement is do;

scribed in the patent to Kearneyx z Trecker," No. 1,053,296, of February 18, 1913. Such overarms have heretofore been adjusted manually, the provision of means for adjustin them mechanicallyinvolving certain difli; culties incident to the necessityfor adjusting the over arms independently at some times and simultaneously at other times.

In providing a simple device for the me: chanical operation of the over arms we have found it convenient to utilize a transverse shaft 25 having a squaredend 26 to which a crank 26 may be fitted, and from which it may readily be detached when desired. It will be noted from Figure 3' that this transverse shaft 25 extends through the boss, or pair of bosses, 27, which provides the. rearmost bearing-tor the overarins 15 and 16. The shaft is disposed immediately beneaththe over arms 15 and 16. The'shaft 25 may conveniently be mounted in removable bearing members 28 which are held in place by j suitable cap screws, as indicated 1n F1gure 3,

and permit the ready assembly upon shaft 25 oi the pinions and of the clutch element, hereinafter to be described.

Figure 6, and inasmuch as these pinions may .vided integrally with rack teeth 45.

be identical in construction the description of one will convey a proper understanding of both. Each pinion 30 is provided centrally with a bore 31 of a suitable size to receive the shaft 25. Suitable teeth 32 are milled in the periphery of the pinion. In the cylindrical end portion 33 is formed a transverse slot 34 adapted to receive ordinary clutch teeth on the axially shiftable clutch member 35.

Clutch member 35 is splined by means of a key 36 to shaft 25 in the usual manner. It is shifted by means of a fork 37 carried by an axially adjustable rod 38 having a bearing in the wall of the columnlO, and having an additional bearing in the ear 39 which depends from boss 27.

It will be noted that each of the bearing members 28 is provided with a radially enlarged head adapted to receive the securing cap screws. At one side of the column this 'head is bored radially to provide a recess in which a spring pressed ball 40 is radially adjustable in the immediate proximity of the rod 38. The rod at this point is provided witlra series of three grooves 41, which grooves are adapted to receive ball 40 in each of three predetermined positions of the shifting rod 38. When the rod is adjusted the ball will yield until it drops into the next succeeding groove of the series in impositive engagement. The clutch member 35 is shifted by means of the ancillary rod 38 instead of by an axial adjustment of the shaft 25 in order to obviate the possibility of an a accidental shifting movement of the clutch during the rotation of shaft 25, and in order further to make it possible to remove instantly the crank from the squared end 26 of shaft 25. A more complicated attachment for such crank would be necessary if the crank itself were employed as a part of the means for shifting the internal clutch.

The length of the clutch sleeve 35 and of the teeth with which it is provided is so determined with reference to the spacing between the pinions 30 that the clutch, in the central position in which it is shown in Figure 3, may have its teeth engaged simultaneously with the clutch teeth (slot 34) of bothof the pinions 30 the above one-half the depth of full mesh with each. From this central position the clutch may be adjusted axially in either direction for full mesh engagement with either of pinions 30 to the exclusion of the other.- Thus, either or both of the pinions may be actuated by the rotation of shaft 25;

-Each of the over arms 15 and 16 is pro- The eX- tremities of such rack teeth form, as indicated in FigureB, a part of the bearing,

surface of the over arm and slide upon the bearing provided at 12 in boss 27. The position of pinions 30 is such that they mesh with the rack teeth, as indicated clearly in Figure 5. As shown in Figure 3, the axial spacing of the pinions is maintained by a spacing sleeve 46 withinthe clutch member 35 and upon shaft- 25. In effect, this sleeve constitutes an enlargement of the shaft, providing shoulders against which the pinions abut. The key 36 extends through the sleeve into splined engagement with the shaft proper.

It will be noted that the pinions 30 are relatively very small. The use, therefore, of a suitable crank 26 to operate shaft 25 will enable the operator to exert a very considerable mechanical advantage upon either or both of the over arms. Power is available, therefore, for the actuation simultaneously of over arms which are comparatively very heavy.

We claim:

1. In a device of the character described, the combination with a column and a pair of over arms journaled therein, of a pendant provided with. bores adapted to receive said over arms and solely supported, and mechanical means adapted selectively for the actuation of either of said over arms.

2. In a device of the character described, the combination with a column and a pair of over arms adjustable therein, of motion transmitting connections fixed against translative movement with reference to the column and selectively operable to adjust either of said over arms, and including means for e2;- erting a nechanical advantage for such adj ustment.

3. In a device of the character described, the combination with a machine tool column and a pair of over arms adjustable independently therein, of a hand operated device for the adjustment of said over arms,

and motion transmitting connections including a clutch mounted upon said column and adapted selectively to connect said device operatively with either of said over arms for their individual adjustment.

. 4. Ina device of the character described, the combination with a machine tool column, a pair of over arms adjustable independently therein, and a pendant supported solely by said over arms, of a hand operated device for the adjustment of said over arms, and motion transmitting connections including a clutch associated with said column adapted selectively to connect said device operatively with either of said over arms for their individual adjustment, said connections including a prime mover so connected to said over arms as to, operate over materially greater distance than an over arm in the adjustment thereof, whereby the resistance of the over arms to movement may be overcome with relatively light power.

5. In a device of the character described, the combination with a machine tool column and a pair of over arms independently adjustable therein, of a manually operable part, and a set of clutch-controlled motion transmit-ting connections said "column adapted to engage said part operatively with either of said over arms selectively and with bothof said over arms for the actuation thereof respectively independently and simultaneously. V

6. In a deviceof the character described, the combination with a machine tool column and over arms adjustable therein, of a rotor operatively connected with each of said over arms for the longitudinal ,adjnstmentthereof, a manually operable shaft,anda clutch adapted selectively'to engage said shaft with either of said rotors.

7. In a device of the character described, the combination with a machine tool column and over arms adjustable therein, of arotor operativelyconnected with each of said over arms for the longitudinal adjustment thereof, a manually operable shaft, and a clutch adapted selectively to engage said shaft with either of said rotors and optionally with both of said rotors simultaneously.

8. In device of the character des ribed, the :combination with a milling machine column'and a pair of adj acentover arms axially adjustable therein, said over arms being pro vided with rack teeth, of a shaft extending transversely with respect to said over arms, individual pinions meshing with the teeth of said over arms, and means selectively connecting eitherof said pinions to said shaft to be operated therefrom.

9. In a device of the character described, the combination with a milling machine column and a pair of over arms independently adjustable axially therethrough, said over arms being formed to provide rack teeth, of pinions engaged With the teeth of each of said over arms, a shaft co-axial with each of said pinions, and a clutch element connected with said shaft and adjustable between said pinions, said pinions being formed to receive engagement therewith, whereby said over arms may be selectively actuated by said shaft.

10. In a device of the character described, the combination with a milling machine column having a number of longitudinal bores and a set of over arms independently adjustable in said bores, of a transverse shaft, pinions on said shaft with their teeth intersecting said bores, said over arms being provided with rack teeth meshing with said pinions and adapted to ride in said bores, a clutch splined to said shaft and adjustably adapted in engagement selectively with said pinion, and means for shifting said clutch sleeve.

11. In a device of the character described, the combination of a column, over arms adjustable in said column and provided with rack teeth, aligned pinions meshing With the teeth of said over arms and axially spaced apart, a shaft coaxial with .sa-idvpinien a u ch e ement connected with said shaf and en ageablewith bo h of said pini ns, said clutch element being of sufficient leng h to engage bothof said piuion imul ane us y, said element being engageable with either Q said pinions to such all extent to clear the other, whe eby said pinions may be selectively actuated and may optionallybe actuated simultaneously.

12. The combination with a milling machine column of plurali y of o erarmsadjustably mounted insaid column and provid d with rack ee h, a co esponding number of pin-ions engaging the rack teethlo'f respective arms, and a d iving clutch e e ment adapted to engage either ofsaid pinions selectively and both of said piniol asinru lv taneously. 1 a

13. The combination with a milling :machine column of a plurality of over arms pro.- vided with bearings in'said column and having rack teeth adapted to ride upon said bearings, shaft extending transversely with re spect to one of said bearing-s, pinions upon said shaft adapted to mesh respectively with the rack teeth of a plurality of over arms, a clutch member connected with said shaft and adjustable with respect to two of said pinions into positions of non-mesh, half mesh, and full mesh,;s aid clutch element being of such a length as-tobe in half mesh with ,each ,of two pinions simultaneously.

1d- Th c mbination with a mil ing anachine column provided with spaced lon,gi,- tudinal'bores and with a transverse bore in: terseeting said longitudinal bores, bearing members "fitted to said transverse EbOIQ to carry a shaft extending therethrough, a shaft journaled in saidymembers means providing teeth projecting from said shaft into each of said longitudinal :bores, and over arms provided with rack :teeth and :HIOUIllLGCl in :said longitudinal bores, said rack teeth meshing with the teeth of said means, whereby said over arms are simultaneously adj ustable.

In a device O5f1th6 ,charaoter described, the comlizinat-i-on with a milling machine ;column roviding spaced longitudinal bores, of a transverse bore intersecting said longitudinal bores, centrally rapertured bearing members fitted within the ends of the transverse wbore, a shaft journaled in said bearing members, pinions mounted on said shaft 231161 having teeth projecting stherefrom into said longitudinal ,sbores, ,over arms in said longitudinal bores provided with teeth meshing with those of said ipinions, :and. a .clutch .-ele'- men-t mounted on said shaft .and adjustable thereon between said pinions and adapted selectively to control the interaction of said shaft with said pinions.

16. The vcombination with a milling. chine columnand overarms-ad-j ustablea-therein in parallelism, said over arms being provided With rack teeth, of a transverse bore in said column, a shaft extending therethrough and carrying pinion teeth meshing with the teeth of said over arms, bearing members supporting said shaft in said transverse bore, a clutch element splined to said shaft and adapted for engagement with either and both of said pinions, a clutch shifting rod provided with notches, and a spring pressed catch adapted impositively to engage said notches todefine a plurality of operative positions of said clutch.

17 The combination with a milling machine column and over arms adjustable therein in parallelism, said over arms being provided with rack teeth, of a transverse bore in said column, a shaft extending therethrough and carrying pinion teeth meshing with the teeth of said over arms, bearing members supporting said shaft in said transverse bore, aclutch element splined to said shaft and adapted for engagement with either and both of said pinions, a clutch shifting rod provided with notches, and a spring-pressed catch adapted impositively to engage said notches to define a plurality of operative positions of said clutch, said catch being mounted in one of said bearing members.

18. The combination with a machine tool column provided with clamp bearings, of a transverse shaft mounted in association with one of said bearings, over arms provided with rack teeth and adjustable through said bearings, pinions carried by said shaft andmeshing with the rack teeth of-said over arms, and a clutch adjustable to a plurality of positions on said shaft for non-mesh, half mesh, and full mesh with each of said pinions, whereby said shaft may be operated selectively to actuate either of said over arms independently and, optionally, both of said over arms simultaneously.

19. In a device of the character described, the combination with a machine tool column provided with bearings, of over arms axially adjustable in said bearings, gears provided with teeth meshing with individual over arms for the adjustment thereof, and a shaft engaged with both of said gears for the simultaneous adjustment of said over arms, one of said gears having clutch means disengageably connecting. it with said shaft whereby one of said over arms is independently adjustable.

20. In a milling machine having a column and a plurality of parallel over arms independently adjustably supported therefrom,

the combination of adjusting means for said over arms including a part shiftable to different positions for actuation of the different of wherebyto actuate. the particular over arm or over arms with which it is engaged at the time of operation.

21.-In a milling machine having a column'and a plurality of parallel over arms movably supported therefrom, the combination of transmission mechanism for simultaneously moving said over arms, including a part journaled in said column and having connections within said column with each of said arms, one of said connections including a clutch disengageable, whereby to permit independent adjustment of one of said arms.

22. In a milling machine having a column and a plurality of parallel over arms supported therefrom for independent movement, the combination of a plurality of means for connecting said over arms for simultaneous movement, one of said means including a member provided with clutch mechanism selectively engageable with each arm for movement therewith and the other means including an actuating member mounted upon said column and operatively connected to actuate said member.

28. Ina device of the character described, the combination with a column and a pair of over arms each independently guided therefrom, of mechanical means for the selective independent movement of either of said over arms, said means being alternatively operable to move both said over arms simultaneously.

EDWARD J. KEARNEY. JOSEPH B. ARMITAGE. 

